Study On Metal Sulfide In Different Dimensions Of Two-Dimensional SnS₂ Load And Its Photocatalysis

With the development of modern science and industry,people's living standards have been continuously improved,but with the following,the two problems of energy shortage and environmental pollution have become increasingly prominent.Under such circumstances,people have begun to carry out environmental management and research and development of new energy.In a large number of exploration studies,the use of solar energy can solve both energy shortage and environmental pollution,and photocatalysis technology is one of the many ways to solve the problem.In the experiment,Fujishima found that on the energized semiconductor TiO₂ electrode,there is a photocatalytic decomposition to produce hydrogen.The results of this research have set off a wave of research and development of semiconductor photocatalysis technology.TiO₂ semiconductor material is a mature researcher in the ideal photocatalyst,safe,stable and low cost.But at the same time,it also has its own shortcomings that make it impossible to apply to production and life as well as commercial applications.In order to improve the materials to meet people's application goals,researching on new narrow bandgap semiconductor materials has been carried out in recent years,among which metal sulfides have been found to have great development prospects.Metal sulfides have the advantages of high solar utilization,structural diversity,good photocatalytic activity,etc.,so the research on metal sulfides also has a certain degree of heat.Among many metal sulfides,SnS₂ has attracted the attention of many researchers based on its many advantages.In order to reduce the recombination rate of photo-generated carriers of semiconductor materials to improve photocatalytic activity,a method of synthesizing heterojunctions between semiconductors has been studied to achieve the goal.In this paper,two-dimensional SnS₂ is used as the research center to carry out research work on the construction of heterojunctions with zero-dimensional,two-dimensional and three-dimensional semiconductor materials,and it is confirmed that the photocatalytic performance has been greatly improved.The main research work of this paper is based on the following:?1?SnS₂ was recombined by hydrothermal method using ZnS as a substrate.We compared the ratio of photoelectrochemical performance improvement with different SnS₂ composite ratios.The results show that the formation of SnS₂/ZnS heterojunction can improve its photoelectrochemical performance compared to pure semiconductor materials.?2?The two-dimensional SnS₂ ultra-thin nanosheet was used as a substrate,and the MoS₂ two-dimensional nanosheet was composited by hydrothermal method.We compared the photocatalytic activity and photoelectrochemical performance of different MoS₂ composite ratios.The results show that the formation of MoS₂/SnS₂ heterojunction can improve photocatalytic activity and photoelectrochemical performance better than pure semiconductor materials.Again,there is an optimal ratio for the compounding process.?3?The three-dimensional In₂S₃ nanoflowers were used as a substrate,and the SnS₂ two-dimensional nanosheets were combined by hydrothermal method.We compared the improvement of photocatalytic activity and photoelectrochemical performance under different SnS₂ composite ratios.The results show that the formation of SnS₂/In₂S₃ heterojunction can greatly improve photocatalytic activity and photoelectrochemical performance compared to pure semiconductor materials.Also,there is an optimum ratio of performance improvement of the composite.